Re: [PATCH v3 2/4] backlight: Expose brightness curve type through sysfs

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IIUC the conclusion is that there is no need for a string attribute because we only need to distinguish between 'perceptual' and 'non-perceptual'. If that is correct, do you have any preference for the attribute name ('perceptual_scale', 'perceptual', ...)?

More a summary than a conclusion! There is a reason I have left a bit or space for others to comment on this over the last month (and a bit).

To be clear my Reviewed-by: means that I believe that the kernel is better with "non-linear/linear/unknown" than without it and that I am comfortable the API isn't likely to be a millstone for us.

Lee, Jingoo: Either of you care to offer $0.02

No, not really. Happy to leave it to your good judgement.